mirror of https://github.com/gungwald/rnd.git
101 lines
3.7 KiB
ArmAsm
101 lines
3.7 KiB
ArmAsm
********************************
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* *
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* SYMBOLS *
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* *
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* AUTHOR: BILL CHATFIELD *
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* LICENSE: GPL2 *
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* *
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********************************
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RNDL .EQU $4e ;Continuously incremented while waiting for keyboard input
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RNDH .EQU $4f ;High byte of RNDL
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FACEXP .EQU $9d ;Address of FAC exponent used by FADDT,FSUBT,FMULTT,FDIVT
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********************************
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* *
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* MEMORY MAPPED INPUT/OUTPUT *
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* ADDRESSES $C000 - $C0FF *
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* *
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********************************
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KBD .EQU $C000 ;BIT 7 IS 1 IF KEY PRESSED
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KBDSTRB .EQU $C010 ;CLEARS KBD BIT 7
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CLR80STO .EQU $C000 ;ALLOW PAGE2 PG1 & PG2 SWITCHING
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SET80STO .EQU $C001 ;ALLOW PAGE2 MAIN & AUX SWITCHNG
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STO80 .EQU $C018 ;1=PAGE2 SWITCHES MAIN/AUX
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;0=PAGE2 SWITCHES VIDEO PAGES
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CLR80VID .EQU $C00C ;TURN OFF 80-COL DISPLAY
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SET80VID .EQU $C00D ;TURN ON 80-COL DISPLAY
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COL80 .EQU $C01F ;0=40 COL IS ON, 1=80 COL IS ON
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TEXTOFF .EQU $C050 ;SELECTS GRAPHICS MODE
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TEXTON .EQU $C051 ;SELECTS TEXT MODE
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TEXT .EQU $C01A ;1=TEXT MODE ACTIVE,0=GRAPH MODE
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MIXEDOFF .EQU $C052 ;USE FULL-SCREEN GRAPHICS
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MIXEDON .EQU $C053 ;USE GRAPHICS WITH 4 LINES TEXT
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MIXED .EQU $C01B ;0=FULL SCREEN, 1=MIXED
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PAGE2OFF .EQU $C054 ;SELECTS PAGE1 OR MAIN VID MEM
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PAGE2ON .EQU $C055 ;SELECTS PAGE2 OR AUX VID MEM
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PAGE2 .EQU $C01C ;1=VID PG2 SELECTED OR AUX SEL
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HIRESOFF .EQU $C056 ;SELECTS LOW-RES GRAPHICS
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HIRESON .EQU $C057 ;SELECTS HIGH-RES GRAPHICS
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HIRES .EQU $C01D ;0=LOW-RES, 1=HIGH-RES
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********************************
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* *
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* SUBROUTINES PROVIDED BY *
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* APPLESOFT BASIC *
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* IN READ-ONLY MEMORY *
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* ADDRESSES $D000 - $F7FF *
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* *
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********************************
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STROUT .EQU $DB3A ;PRINT STRING IN Y,A
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GIVAYF .EQU $E2F2 ;CONVERT 2-BYTE INT A(HI) Y(LO) TO FLOAT IN FAC
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CONINT .EQU $E6FB ;CONVERT FAC TO BYTE IN X, ERR IF FAC > 255
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FADD .EQU $E7BE ;FAC = MEM + FAC, MEM ADDR IS Y(HI) A(LO)
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FSUB .EQU $E7A7 ;FAC = MEM - FAC, MEM ADDR IS Y(HI) A(LO)
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FMULT .EQU $E97F ;FAC = MEM * FAC, MEM ADDR IS Y(HI) A(LO)
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FDIV .EQU $EA66 ;FAC = MEM / FAC, MEM ADDR IS Y(HI) A(LO)
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FADDT .EQU $E7C1 ;FAC = ARG + FAC, MUST LOAD FACEXP INTO A FIRST
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FSUBT .EQU $E7AA ;FAC = ARG - FAC, MUST LOAD FACEXP INTO A FIRST
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FMULTT .EQU $E982 ;FAC = ARG * FAC, MUST LOAD FACEXP INTO A FIRST
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FDIVT .EQU $EA69 ;FAC = ARG / FAC, MUST LOAD FACEXP INTO A FIRST
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MUL10 .EQU $EA39 ;MULTIPLY FAC BY 10
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FCOMP .EQU $EBB2 ;COMP MEM TO FAC
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QINT .EQU $EBF2 ;CONVERT FAC TO INTEGER
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FLOAT .EQU $EB93 ;CONVERT A TO FAC, I THINK
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MOVAF .EQU $EB63 ;MOVE FAC INTO ARG
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MOVMF .EQU $EB2B ;MOVE FAC TO MEMORY Y,X
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MOVFA .EQU $EB53 ;MOVE ARG TO FAC
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MOVFM .EQU $EB2B ;MOVE MEMORY TO FAC
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INT .EQU $EC23 ;APPLESOFT INT FUNCTION
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PRINTFAC .EQU $ED2E ;PRINT FAC. USES FOUT,STROUT
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FOUT .EQU $ED34 ;FAC TO STRING, FAC DESTROYED
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RND .EQU $EFAE ;APPLESOFT RND FUNCTION
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********************************
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* *
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* SUBROUTINES PROVIDED BY *
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* SYSTEM MONITOR PROGRAM *
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* IN READ-ONLY MEMORY *
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* ADDRESSES $F800 - $FFFF *
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* *
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********************************
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PLOT .EQU $F800 ;PLOT BLOCK ON LOW-RES SCREEN
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HLINE .EQU $F819 ;HORIZONTAL LINE
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VLINE .EQU $F828 ;VERTICAL LINE
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CLRSCR .EQU $F832 ;CLEAR LOW-RES SCREEN
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CLRTOP .EQU $F836 ;CLEAR THE TOP OF LOW-RES
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NEXTCOL .EQU $F85F ;INCREMENT COLOR BY 3
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SETCOL .EQU $F864 ;SET LOW-RES GRAPHICS COLOR
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SCRN .EQU $F871 ;READ THE LOW-RES SCREEN
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TEXTCMD .EQU $FB2F
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TEXTMODE .EQU $FB39
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GR .EQU $FB40 ;BASIC GR COMMAND
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WAIT .EQU $FCA8
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COUT .EQU $FDED ;WRITE A CHARACTER
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CROUT .EQU $FD8E ;WRITE A CARRIAGE RETURN
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PRBYTE .EQU $FDDA ;PRINT VALUE OF BYTE
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